Phagoaata morgani morgani (Stevens % Boring, 1906) 



Synonyms: Planaria trunaata Leidy, 1851; P. morgani Stevens § Boring, 1906; 

 P. alhissima: Kepner 5 Rich, 1918 (not Vejdovsky, 1883); Dendroaoelvm 

 trunaatum: Girard, 1893; Fontioola trnmaata: Hyman, 1931; F. morgani: Castle 

 § Hyman, 1934; F. morgani morgani: Ball, 1969; Phagoaata morgani: Hyman, 

 1937; "^.Dendroooelum superbum Girard, 1850; ?Galeoaephala superba: Stimpson, 

 1857; ?Phagoaata aavemiaola Hyman, 1954; IFontioola oavemioola: Ball, 1969, 



43 



44 



pp g de od 



am mp ode bd gp 



Fig. 44 after Kenk (1935). 



Average length o£ sexually mature specimens 14 mm, width 2 mm. Anterior 

 end truncate, frontal margin straight, convex, or concave when the animal 

 is in motion. No adhesive organ. Lateral edges of head rounded, with a 

 very slight narrowing behind them. Eyes normally two, close together and 

 far removed from the frontal margin. Unpigmented, white. Anterior ramus 

 of intestine ends behind the eye level in adult specimens. Externally 

 similar to P. nivea ( for differences see that species) and Planaria 

 oaoulta (which has the intestine ending in front of the eyes) . Penis with 

 rather small bulb and conical or rounded papilla. Characteristic for the 

 species is a muscular, wart-like structure with thin, flattened epithelium 

 at the tip of the penis papilla. The sperm ducts enter the penial bulb 

 laterally and unite to a generally tubular ejaculatory duct which opens 

 into the atrium on the ventral side of the penis papilla. There is no 

 distinct seminal vesicle developed. Bursa sac-shaped, its duct runs 

 posteriorly, usually to one side (generally left) of the midline, widens 

 gradually without forming a pronounced vagina, and ends close to the 

 gonopore. The common oviduct enters the posterior part of the male atrium 

 near the outlet of the bursal duct. Reproduction sexual and by fission. 

 Cocoon ellipsoidal or spherical, unstalked. Inhabitant of springs and 

 cold creeks of eastern North America from New Brunswick to North Carolina 

 and west to Wisconsin and Kentucky, also found in Taylor Creek, El Dorado 

 County, California (here apparently introduced). Principal literature: 

 Stevens § Boring (1906), Kenk (1935, 1944). 



40 



